include/uapi/linux/vfio.h: Fix trivial typo - _IORW should be _IOWR instead

There is no macro called _IORW, so use _IOWR in the comment instead.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Link: https://lore.kernel.org/r/20220516101202.88373-1-thuth@redhat.com


Signed-off-by: Alex Williamson <alex.williamson@redhat.com>